CN114567956B - Method and system for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply - Google Patents
Method and system for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply Download PDFInfo
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- CN114567956B CN114567956B CN202210221340.1A CN202210221340A CN114567956B CN 114567956 B CN114567956 B CN 114567956B CN 202210221340 A CN202210221340 A CN 202210221340A CN 114567956 B CN114567956 B CN 114567956B
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- 238000005286 illumination Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000010485 coping Effects 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/185—Controlling the light source by remote control via power line carrier transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a method and a system for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply, wherein the method comprises the following steps: transmitting a DC carrier signal, detecting the actual falling time t of the DC output voltage f1 The method comprises the steps of carrying out a first treatment on the surface of the Will actually fall time t f1 And a set falling time t f Comparing; at t f1 Greater than t f In the case of (2), a dummy load is put in, and the direct current carrier signal is retransmitted; again detecting the actual fall time t of the dc output voltage f1 And is matched with the set falling time t f Comparison is made, at t f1 Equal to t f In the event of a disconnection of the dummy load; the system is for performing the method. The invention can effectively solve the problem that the voltage drop time of the direct current carrier signal is influenced by the load under the light load condition, and the direct current carrier signal can be output according to the design waveform of the control module no matter what the size of the actual lamp load is, thereby effectively and accurately realizing the control of the dimming, the switching and the like of the lamp load under any load condition.
Description
Technical Field
The invention relates to the technical field of illumination control, in particular to a method and a system for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply.
Background
In the existing direct current lighting power supply system, an AC-DC rectification module is generally adopted to convert alternating current into direct current, and then direct current is used for supplying power to a lamp load. The direct current voltage value output by the AC-DC rectifying module is controlled by software and continuously adjustable, and by utilizing the characteristic, the software controls the direct current voltage value output by the AC-DC rectifying module to be continuously output according to a fixed amplitude difference while the direct current is supplied, so that a direct current carrier signal can be formed for communication, and the control of dimming, switching and the like of a lamp load is realized.
When the direct current output voltage is used as a carrier wave for communication, the direct current output voltage is influenced by voltage amplitude difference, change period, rising time and falling time. FIG. 1 is a schematic diagram of a typical waveform of a DC carrier signal with key parameters including voltage amplitude difference (ΔV), variation period (ΔT), rise time (T) r ) And a falling time (t f ). When the direct current carrier signal is sent, the actual voltage amplitude difference, the change period and the rising time are completely controlled by software and are irrelevant to other factors, namely, are consistent with a set value; but the actual fall time (t f1 ) In addition to being controlled by software, it is also related to the discharge speed of the output capacitance of the AC-DC rectification module. If the lamp load is too small, the discharge speed of the output capacitor of the AC-DC rectifying module is insufficient, resulting in an actual fall time (t f1 ) Is longer than the set fall time (t f ) The situation of (1) further causes distortion of the direct current carrier signal, so that errors occur when the lamp load end analyzes the control command, and finally, the control of dimming, switching and the like of the lamp load cannot be realized.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a method and a system for coping with light-load direct-current carrier signal distortion in direct-current lighting power supply, which can solve the problem of direct-current carrier signal waveform distortion under the light-load condition and more reliably realize the control of light modulation, switch and the like on lamp loads.
The first aspect of the present invention provides a method for coping with light-load dc carrier signal distortion in dc lighting power supply, including:
transmitting a DC carrier signal, detecting the actual falling time t of the DC output voltage f1 ；
Will actually fall time t f1 And a set falling time t f Comparing;
at t f1 Greater than t f In the case of (2), a dummy load is put in, and the direct current carrier signal is retransmitted;
again detecting the actual fall time t of the dc output voltage f1 And is matched with the set falling time t f Comparison is made, at t f1 Equal to t f In the event of a fault, the dummy load is switched off.
Preferably, the dummy load is arranged in parallel to the output of the dc lighting power supply system, i.e. it is arranged in parallel to the lamp load.
In any of the above embodiments, it is preferable that the resistance value of the dummy load is based onThe method comprises the steps of obtaining an output equivalent capacitor of a direct-current illumination power supply system, wherein the value of the output equivalent capacitor is a capacitance value obtained after the output capacitors of a plurality of AC-DC rectifying modules on the direct-current illumination power supply system are connected in parallel, V is an output voltage of the direct-current illumination power supply system, namely a rated working output voltage value of the direct-current illumination power supply system, deltaV is a voltage amplitude difference of a set direct-current carrier signal, and t f Is the set falling time of the DC carrier signal.
In any of the above embodiments, preferably, the dummy load has a resistance value such that the dummy load alone is applied when the dc lighting power supply system is idling, so that the actual falling time t f1 And a set falling time t f Equal corresponding minimum load resistance values.
In any of the above-described modes, it is preferable that a delay (dead time) is provided at the time of inputting the dummy load and cutting off the dummy load to ensure that the output voltage of the dc lighting power supply system is stable.
In any of the above-described modes, it is preferable that the input and the disconnection of the dummy load are controlled by controlling the on/off of a switch S, and the switch S is provided in series with the dummy load.
In any of the above schemes, it is preferable that the switch S is a dc contactor, and the rated operating voltage and the rated operating current of the switch S are both greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
A second aspect of the present invention provides a system for coping with light-load dc carrier signal distortion in dc lighting power supply, for executing a method for coping with light-load dc carrier signal distortion in the dc lighting power supply, the system comprising: the voltage detection module is connected with the control module and is used for detecting the actual falling time t of the direct current output voltage when the direct current carrier signal is sent f1 And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltage f1 Is longer than the falling time t of the set DC carrier signal f And when the DC carrier signal is cut in, the cut-in dummy load is controlled, and the DC carrier signal is retransmitted.
Preferably, the control module is further configured to, after retransmitting the dc carrier signal and determining the actual fall time t of the dc output voltage f1 Equal to the set fall time t of the DC carrier signal f When the control cuts off the dummy load.
In any of the above embodiments, the dummy load is preferably disposed in parallel to the output end of the dc lighting power supply system, that is, it is disposed in parallel to the lamp load.
In any of the above schemes, the control module preferably controls the input and the disconnection of the dummy load by controlling the on-off of a switch S, and the switch S is arranged in series with the dummy load.
In any of the above schemes, it is preferable that the switch S is a dc contactor, and the rated operating voltage and the rated operating current of the switch S are both greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
According to the method and the system for dealing with the light-load direct-current carrier signal distortion in the direct-current lighting power supply, the dummy load is added at the output end of the direct-current lighting power supply system, and the input and the disconnection of the dummy load are controlled, so that the problem that the voltage drop time of the direct-current carrier signal is influenced by the load under the condition of the light load can be effectively solved, the direct-current carrier signal can be output according to the design waveform of the control module no matter the size of the actual lamp load, the failure of lamp load control caused by the waveform distortion of the direct-current carrier signal is avoided, and the dimming, the switching and other control of the lamp load can be effectively and accurately realized under any load condition.
Drawings
Fig. 1 is a schematic diagram of a typical set dc carrier signal waveform.
Fig. 2 is a waveform comparison diagram of a dc carrier signal actually output and a set dc carrier signal under the condition that no light load occurs.
Fig. 3 is a waveform comparison diagram of a dc carrier signal actually output and a set dc carrier signal under a light load condition.
Fig. 4 is a flow chart of a preferred embodiment of a method for dealing with light-load dc carrier signal distortion in dc lighting power supply according to the present invention.
Fig. 5 is a schematic diagram of a preferred embodiment of a system for dealing with light-load dc carrier signal distortion in dc lighting power supply according to the present invention.
Fig. 6 is a schematic diagram of a preferred embodiment of a switch S of a system for dealing with light-load dc carrier signal distortion in dc lighting power supply according to the present invention.
Detailed Description
The invention will be described in more detail with reference to specific examples.
Example 1
In dc lighting power supply, control such as dimming and switching is performed on a lamp load by means of dc carrier communication, and particularly, a field for realizing single lamp or area control is requiredDc carrier communication has unique advantages. When transmitting a DC carrier signal, the actual voltage amplitude difference, the variation period and the rise time (t r1 ) Completely controlled by software, is irrelevant to other factors, namely is consistent with a set value; but the actual fall time (t f1 ) In addition to being controlled by software, the discharge speed of the output capacitor of the AC-DC rectification module is related to the size of the lamp load involved in the output discharge loop of the AC-DC rectification module.
If the lamp load is large enough, namely no light load condition occurs, the voltage drop time of an output discharge loop of an AC-DC rectifying module of the DC illumination power supply system formed by the lamp load is less than or equal to the voltage drop time t of a set DC carrier signal f The actual fall time t of the DC output voltage of the DC carrier signal transmitted at this time f1 Is fully software controlled, i.e. the transmitted dc carrier signal and the set dc carrier signal remain identical, as shown in fig. 2.
However, in general, since the lamp load power is small, especially after the lamp is turned off by remote standby, the lamp load is only standby power consumption (less than 1W/pcs) of the lamp driving power supply, and a light load condition occurs at this time. When light load occurs, the voltage drop time of the output discharge loop of the AC-DC rectification module of the DC lighting power supply system formed by the lamp load is longer than the voltage drop time t of the set DC carrier signal f The actual fall time t of the DC output voltage of the DC carrier signal transmitted at this time f1 The voltage drop time t of the set direct current carrier signal is larger than the influence of the discharge speed of the discharge capacitor of the AC-DC rectifying module f Further, the transmitted dc carrier signal and the set dc carrier signal are inconsistent, i.e., the actually transmitted dc carrier signal is distorted, as shown in fig. 3.
Because of the distortion of the actually transmitted direct current carrier signal, the analysis of the direct current carrier signal at the load end of the lamp is wrong, and thus the actions such as dimming, switching and the like cannot be correctly executed. For this reason, for the situation that the dc carrier signal shown in fig. 3 is distorted, a method for coping with the distortion of the light-load dc carrier signal in the dc lighting power supply is provided, and the method includes:
transmitting a DC carrier signal, detecting the actual falling time t of the DC output voltage f1 ；
Will actually fall time t f1 And a set falling time t f Comparing;
at t f1 Greater than t f In the case of (2), a dummy load is put in, and the direct current carrier signal is retransmitted;
again detecting the actual fall time t of the dc output voltage f1 And is matched with the set falling time t f Comparison is made, at t f1 Equal to t f In the event of a fault, the dummy load is switched off.
Specifically, as shown in fig. 4, the method for coping with light-load dc carrier signal distortion in the dc lighting power supply includes:
step S10: transmitting a DC carrier signal, detecting the actual falling time t of the DC output voltage f1 The method comprises the steps of carrying out a first treatment on the surface of the The direct current illumination power supply system is provided with an output voltage detection function, and can read the output voltage in real time, and record the starting time and the ending time of voltage change when the direct current carrier signal is transmitted each time, so that the actual falling time t of the direct current output voltage can be obtained f1 。
Step S20: will actually fall time t f1 And a set falling time t f Comparing; if the comparison finds that the actual falling time t f1 And a set falling time t f The direct current carrier signals are considered to be normally transmitted when the direct current carrier signals are equal; if the comparison finds that the actual falling time t f1 Is greater than the set falling time t f And considering that a light load condition occurs, and the direct current carrier signal is not normally transmitted.
Therefore, when t is found in step S30 f1 Greater than t f At this time, step S40 is performed: and putting a dummy load into the system to retransmit the direct current carrier signal.
The discharge time of the discharge capacitor of the AC-DC rectification module has the following relation: t=r 1 Cxln (V/DeltaV) where R 1 The load equivalent resistance of the direct-current illumination power supply system is represented by C, the output equivalent capacitance of the direct-current illumination power supply system is represented by C, the output voltage of the direct-current illumination power supply system is represented by V, the voltage amplitude difference is represented by delta V, and the values of V, C and delta V are constant values, so that the discharge time T of the discharge capacitor and the load equivalent resistance R of the system are represented by 1 Is in a direct proportion relation; when light load is carried, the equivalent resistance R of the system load 1 The value of (2) is larger, and the discharge time T of the discharge capacitor is proportionally longer.
The dummy load is arranged at the output end of the direct current illumination power supply system in parallel with the lamp load, and is input when the light load condition is judged to occur, so that the equivalent resistance R of the system load is reduced 1 Further, the discharge time T of the discharge capacitor, which is the actual falling time T of the DC output voltage of the DC carrier signal, is reduced f1 。
The resistance value of the dummy load is based onThe method comprises the steps of obtaining an output equivalent capacitor of a direct-current illumination power supply system, wherein the value of the output equivalent capacitor is a capacitance value obtained after the output capacitors of a plurality of AC-DC rectifying modules on the direct-current illumination power supply system are connected in parallel, V is an output voltage of the direct-current illumination power supply system, namely a rated working output voltage value of the direct-current illumination power supply system, deltaV is a voltage amplitude difference of a set direct-current carrier signal, and t f Is the set falling time of the DC carrier signal. In this embodiment, it is preferable that the dummy load has a resistance value such that the dummy load alone is applied when the dc lighting power supply system is idling, so that the actual falling time t f1 And a set falling time t f Equal corresponding minimum load resistance values.
Step S50: again detecting the actual fall time t of the dc output voltage f1 And is matched with the set falling time t f A comparison is made.
In step S60, t is determined f1 Equal to t f In the case of (a), the normal transmission of the dc carrier signal is successful, and step S70 is performed: disconnecting the dummy load; otherwise, step S80 is executed to issue alarm information.
In step S40 and step S70, the input and the disconnection of the dummy load are controlled by controlling the on-off of a switch S, and the switch S is connected in series with the dummy load. In this embodiment, it is preferable that the switch S is a dc contactor, and the rated operating voltage and the rated operating current of the dc contactor are both greater than the actual voltage and the current flowing through the dummy load, and a redundant design is adopted.
Because the DC lighting power supply system is in a light load state when the dummy load is put into in the step S40; the dummy load is small, and the actual falling time t can be also realized by only independently inputting the dummy load when the direct-current illumination power supply system is in no-load state f1 And a set falling time t f And the dummy load is input and cut off within the range of the load adjustment rate of the direct-current illumination power supply system, so that the condition of unstable power supply is not caused. Meanwhile, a delay (dead time) is provided when the dummy load is put in and cut off, so as to further ensure the stability of the output voltage of the direct current illumination power supply system.
Example 2
As shown in fig. 5, a system for coping with light-load dc carrier signal distortion in dc lighting power supply is configured to execute a method for coping with light-load dc carrier signal distortion in dc lighting power supply, where the system includes: the voltage detection module is connected with the control module and is used for detecting the actual falling time t of the direct current output voltage when the direct current carrier signal is sent f1 And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltage f1 Is longer than the falling time t of the set DC carrier signal f When the DC carrier signal is retransmitted, the control module is also used for judging the actual falling time t of the DC output voltage when the DC carrier signal is retransmitted f1 Equal to the set fall time t of the DC carrier signal f When the control cuts off the dummy load.
The dummy load is arranged at the output end of the direct current illumination power supply system in parallel, namely, the dummy load is arranged in parallel with the lamp load. The control module controls the input and the disconnection of the dummy load by controlling the on-off of a switch S, and the switch S and the dummy load are arranged in series. The switch S is a direct current contactor, the rated working voltage and the rated working current of the switch S are both larger than the actual voltage and the flowing current at the two ends of the dummy load, and a redundant design is adopted.
As shown in fig. 6, the control module controls the on-off of a coil of the direct current contactor, the coil is electrified, the direct current contactor is closed, and the dummy load is put into operation; the coil is not electrified, the direct current contactor is disconnected, and the dummy load is cut off.
In this embodiment, it is preferable that the voltage detection module and the control module are disposed in a dc power supply cabinet.
By adding a dummy load at the output end of the direct current illumination power supply system and controlling the input and the switching of the dummy load, the problem that the voltage drop time of a direct current carrier signal is influenced by the load under the light load condition can be effectively solved, the direct current carrier signal can be output according to the design waveform of a control module no matter how much the actual lamp load is, and the control failure of the lamp load can not be caused by the waveform distortion of the direct current carrier signal, so that the control of the dimming, the switching and the like of the lamp load can be effectively and accurately realized under any load condition.
Example 3
The method and the system for coping with the light-load direct-current carrier signal distortion in the direct-current illumination power supply are suitable for direct-current illumination power supply systems capable of direct-current carrier communication, and are particularly suitable for direct-current illumination power supply systems needing remote control and direct-current illumination power supply systems needing control over single lamps or areas, such as street lamp systems, factory illumination systems, large-area indoor illumination systems, landscape lamp illumination systems, tunnel illumination systems and the like.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the foregoing embodiments are illustrative of the present invention in detail, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents, which do not depart from the scope of the technical scheme of the present invention.
Claims (7)
1. A method for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply comprises the following steps: the method comprises the steps of sending a direct current carrier signal, wherein the direct current carrier signal is used for controlling the load of the lamp, and is characterized in that: further comprises:
detecting the actual falling time t of the DC output voltage f1 ；
Will actually fall time t f1 And a set falling time t f Comparing;
at t f1 Greater than t f In the case of (2), a dummy load is put in, and the direct current carrier signal is retransmitted;
again detecting the actual fall time t of the dc output voltage f1 And is matched with the set falling time t f Comparison is made, at t f1 Equal to t f If not, sending out alarm information;
the dummy load is arranged at the output end of the direct current illumination power supply system in parallel, namely, the dummy load is arranged in parallel with the lamp load;
the resistance value of the dummy load is based onThe method comprises the steps of obtaining an output equivalent capacitor of a direct-current illumination power supply system, wherein the value of the output equivalent capacitor is a capacitance value obtained after the output capacitors of a plurality of AC-DC rectifying modules on the direct-current illumination power supply system are connected in parallel, V is an output voltage of the direct-current illumination power supply system, namely a rated working output voltage value of the direct-current illumination power supply system, deltaV is a voltage amplitude difference of a set direct-current carrier signal, and t f The falling time of the DC carrier signal is set;
the resistance value of the dummy load is that the dummy load is independently input when the direct-current illumination power supply system is in no-load state, so that the actual falling time t can be also realized f1 And is provided withConstant fall time t f Equal corresponding minimum load resistance values.
2. The method for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply according to claim 1, wherein: when the dummy load is put in and cut off, a delay time, namely dead time, is set to ensure that the output voltage of the direct current illumination power supply system is stable.
3. The method for coping with light-load direct-current carrier signal distortion in direct-current illumination power supply according to claim 1, wherein: the input and the disconnection of the dummy load are controlled by controlling the on-off of a switch S, and the switch S is connected with the dummy load in series.
4. A method for dealing with light-load dc carrier signal distortion in a dc lighting supply as recited in claim 3, wherein: the switch S is a direct current contactor, the rated working voltage and the rated working current of the switch S are both larger than the actual voltage and the flowing current at the two ends of the dummy load, and a redundant design is adopted.
5. The utility model provides a system of handling light load direct current carrier signal distortion in direct current illumination power supply which characterized in that: a method for performing the handling of light-load dc carrier signal distortion in a dc lighting supply according to any one of claims 1-4, the system comprising: the voltage detection module is connected with the control module and is used for detecting the actual falling time t of the direct current output voltage when the direct current carrier signal is sent f1 And sends it to the control module; the control module is used for judging the actual falling time t of the direct current output voltage f1 Is longer than the falling time t of the set DC carrier signal f And when the DC carrier signal is cut in, the cut-in dummy load is controlled, and the DC carrier signal is retransmitted.
6. Handling in a direct current illumination supply as recited in claim 5The system for distorting the light-load direct-current carrier signal is characterized in that: the control module is also used for retransmitting the DC carrier signal and judging the actual falling time t of the DC output voltage f1 Equal to the set fall time t of the DC carrier signal f When the control cuts off the dummy load.
7. The system for dealing with light-load dc carrier signal distortion in a dc lighting supply of claim 6, wherein: the dummy load is arranged at the output end of the direct current illumination power supply system in parallel, namely, the dummy load is arranged in parallel with the lamp load; the control module controls the input and the disconnection of the dummy load by controlling the on-off of a switch S, and the switch S and the dummy load are arranged in series.
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